Dr. BHB - identity rash under breast?

For about a week I've had this discolored area under my breast that itches and has bumps on it. I usually wear sports bras, I'm thinking maybe a sweat buildup…

DermTV - How to Treat Under Breast Rashes & Infections [DermTV.com Epi 190]

Rash Under Breast (Interigo): Causes, Treatment, and More

Rash under your breasts

Rash under breast: Causes, treatments, and more

Rash under breast: Causes, treatments, and more

I'M SCARED The Damn Thing

Poster Presentations - 2013 - Journal of Gastroenterology and Hepatology - Wiley Online Library

Rash Under Breast: Causes, Treatment, and Prevention

Rash Under Breast: Causes, Treatment, and Prevention

HOW TO GET RID OF A RASH UNDER BREASTS